When Donald Trump announced his candidacy last summer, the experts rolled their eyes. They'd heard it before and few took him seriously. But his blunt talk, and promise to "Make America Great Again," struck a nerve. He became the GOP frontrunner, with a base of voters whose belief in the man borders on fanaticism. In "Donald Trump – The Disrupter," airing Saturday and Sunday at 8 p.m. ET, Fox News gives viewers access inside this improbable presidential campaign – warts and all -- speaking to the developer's family, friends and supporters, and going on the road with the candidate himself. Trump has disrupted the pundits, the GOP, the presidential race and business-as-usual. This assault on the political world has naturally created pushback, and the hour also investigates the resistance Trump has gotten from both right and left – and the damage he has done to himself.